Dental flask



- Sept. 6, 1932. I H} HI-HAZELTINE 1,875,596

DENTAL FLASK Filed May 26, 1950 2 sheets-sh et 1 P 6, H. H. HAZELTINE 1,875,596

DENTAL FLASK Filed May 26, 1930 2 Sheets-Sheet 2 I iPatented Sept. 6, 1932 I I uNrr n STATES PATENT F E HARRY n. HAZRL INR, or EVERETT, WASHINGTON, AssiGNo o THE iT 'co com- PANY or PORTLAND, QREGON, A coRPoRATioN or oRneoN' DENTAL FLASK Application filed May 26, 1930. SeriaI NO. 455,823.

My invention relates to dental flasks and whereby to assure that the entire abutting the like. i v edges'of the flask parts, when assembled, will Dental flasks, as heretofore used in the makbebrought into close contact and incomplete ing of artificial dentures, have commonly closures? andthelike will beprevented. 1 consisted of a metal vessel divided into two To this end, I have provided a dental flask 55 parts along a horizontal median plane and consisting of three parts, abase having a cenof such size and shape as to contain the molds tral cavity therein adapted to receive onecof of the said artificial denture in which a plate the molds of ,the denture, an annular, split of rubber of the like is cast. The said plate wall portion adapted to receive the other I bearing the artificial teeth insimulated armold of-the denture and to be mounted on said 0 rangement and appearance to the natural base in alignment with the interior wall teeth and gums. thereof, and a cover adapted to-be arranged In the making of artificial dentures in such on said wall portion; 1 1 flasks, no satisfactory means have been pro- Further, in order to insure that the flask vided to prevent themolds from being imparts may be pressed t'o'getherwithaneven- 65 properly brought into apposition when the ly distributed pressure exerted over their flask parts are assembled, with the result that rim ter margins, I have providedthecover h molds frequently'areldamaged a the withthree equally spaced upwardly projectartificial teeth disar'ranged from their proping rotuberances adjacent its perimeter marer arrangement.

Further, 110 me n h ve n Pr v to on said protuberances and-means carried by facilitate the removal of the finished denture th i t r argm of said base for drawjfrom the flask after the curing operation'is i id lat dow on aid cover with the completed, with the result tha he fin annular wall portion therebetween, whereby denture is frequently injured. their abutting edges will'be brought into close 7 Therefore, the object of my invention is t t, i t to provide a dental flask having means adapt- Th e d other incidental features ofmy .tOfaCiHtHtB'thQ assembling of fi .flask, the details of.construction, andthe pa'rts-withoutinjury to the mold or denture m th d of using the same 1 are hereinafter to be cast therein. fully described with referenceto the accomf so same. i

A further object of my invention is to proi drawings vide'algdental flask adapted to facilitate the 7 I th d i l i 1 removalof the finish ed denture'from theflask Fi 1 shows an levation of my dentalflask after it has beencured,withoutinjury to the fu11y mb1 d'; H I r a i l Fig. 2 shows a similar View looking at the 85 Furthermore,-in the making of artificial bott f th fl k; l i V dentures, care mustbe taken when the flask V 1 3 shows a, top iew of my'flask with is assembled that the abutting edges 0f the the plate removed, the bolts being hown in parts be brought into close'cont-act at all tio y Y 40 poin s On their p r m rs- Fili r t ri g Fig. i'shows a section taken on the line 90 t abutting e g of the'flaskp t e ti y L- i of Fig.1 3 and illustrates further details together causes the denture to be pressed of construction; 5

moredeeply lnto the mold at one place, then Fig, 5 shows a secion taken on the line in another, thus throwing the artificial teeth 5+5 of Fig. 3; 1

out of alignment and causing misarticulation Fig 6 shows a perspective view of thean- 95 i when placed in the individuals mouth. nular wall portion; and I V Therefore, a further object of my invention Fig. 7 shows a fragmentary section of the is to provide a dental 'flask'adapted to be annular wall portion takenon the l ne 7-7 pressed together with'equal and compensated .of Fig. 4. V, i

pressure over its entire perimeter margins, Referring now 'to the figuresiMy dental 10 gins, a resilient plate adapted to be. arranged flask comprises three parts, a base a, an annular wall portion 5, and a cover 0.

The base a is internally recessed as at d, more or less in the general form of the mold of a denture, and is provided on its exterior with three equally spaced bosses h provided with bolt recesses 70 in which clamping bolts 2', hereinafter further described, are adapted to be inserted.

External, vertical groovesm are provided at opposite points on the base a, arranged so that their adjacent sides are normal with and touch the transverse, median, vertical plane of the flask, as illustrated by the line m in Fig 2.

The annular wall portion bis similar in shape and contour to the base a, and is split at r and provided with lugs 25 adjacent the abutting ends, 'throughwhich a bolt 8 is inserted, for holding them in abutment. By this construction, the contents of the flask may be conveniently removed by loosening the bolt 8 which will permit the annular wall portion to expand.

The said'wallportion b is adapted to be seated on the base a in alignment therewith. Downwardly projecting lugs 5 are provided adapted to register with the recesses m. The lugs 5 and'recesses m are formed with abutting plane faces, and the corners of the lugs are rounded or tapered .as at Sat, 5b,the taper of the corner 5?) being slightly longer. The

faces of the said lugs also are-tapered adjacent their ends, as at 50. V

@Bythis construction, when one of the molds of the denture to be cured is placed in the istration with the bolt holes base, and the other in the wall portion with the denture arranged between them, the two folds may be brought into juxtaposition by a gentle rocking motion from either side or transversely, so that neither the molds will be damaged or the denture disarranged.

Space'd ribs 6 are provided .onthe exterior of the wall portion 6 forming grooves in regof the bosses h on the base. i

The cover 0 is similar in outline to the wall portion 6 and is provided with studs 10 on its under surface adapted'to engage with the interior edge of the wall portion. Lateral enlargements 11 are formed on the rim of the cover in'which bolt holes 12'areprovided in alignment with the bolt recesses k of the bosses h on the base. Equally spaced, upwardly projecting protuberances 14 are provided on the upper surface of the cover arranged so as to lie in radial planes midway between the said bolt holes 12.. The said protuberancesbeing so formed that their high points are adjacent the rim of the cover 0. v V V v The laminated, circular plate 15 of relatively stiff, spring like metal is provided, adapted to be arranged on said protuberances,

' of the cover due to the pressure is having bolt holes 13 in registration with the bolt holes 12 of the cover 0.

When my flask has been assembled with the molds and denture in place, in order that the flask parts may be pressed together with an evenly distributed pressure, so that the compression on the molds will be uniform throughout, the plate 15 is arranged on the protuberances 14 of the cover 0 and the before mentioned bolts i are inserted through the bolt recesses is so as to project upwardly between the ribs 9 on the wall portion with their ends projecting through the holes 12 in the cover and the holes 13 in the plate. Nuts 2" are threaded on the ends of the said bolts, whereby the plate 15 is drawn down onthe cover 0 to press the flask parts together.

By this construction, since the plate 15 is supported at three equally spaced parts on the protuberances 14 and the strain of the bolts 2' are also'at three equally spaced points,

located, respectively, midway betweenthe said protuberances, it will be immaterial whether all the nuts 71 have been threaded down onthe bolts e to the same degree, since be compensated by the said three point support and thus an equal and evenly distributed pressure will be exerted over the perimeter the under side of thebase a for'convenience in placing the flask and removing it from the retort by means of a suitable hooked instrument, not shown.

Further by locating the protuberance 14 on the marginal portion of the cover, the clamping force of the bolts is brought directly onto the abutting marginal edges and deformation prevented, which might otherwise be transmitted to the material within the flask and create an unequal pressure upon the molds contained therein.

I. claim: a

'1. A dental flask comprising separatesections, the upper face of the upper section provided at its perimeter with three equi-distantly spaced supporting projections all coming substantially to a point in a common horizonal plane, a resilient clamping plate supported upon said means located at the perimeter of the flask between and equi-distant'from-said supporting projections, said compression means extending through said flask sections and said tions including a. cover, the upper face of which is provided at its perimeterwith three equl-distantly spaced supporting projections margins of said flask and the contents there 7 projections, compression any difference in strain between the bolts will i k lug 17 having an eye'18 is provided on was all coming substantially to a point in a common horizontal plane, a resilient clamping plate supported upon said projections, compression means located at the perimeter of the flask between and equi-distant fromsaid supporting projections, said compression means extending through said flask sections and said clamping plate, whereby the force of said compression means is uniformly applied in line with the walls of the flask, in drawing the sections of the flask together.

3. A dental flask comprising separate sections, the upper face of the upper section provided at its perimeter with three equidistantly spaced supporting projections all coming substantially to a point in a common horizontal plane, a resilient clamping plate supported upon said projections, bolts located at the perimeter of the flask between and equidistant from said supporting projections,

said bolts extending through said flask sections and said clamping plate, whereby the force of said bolts is uniformly applied in line with the walls of the flask, in drawing the sections of the flask together.

4:. A dental flask comprising separate sections including a cover, the upper face ofwhich is provided at its perimeter with three equi-distantly spaced supporting projections all coming substantially to a point in a common horizontal plane, a resilientclamping plate supported upon said projections, bolts located at the perimeter of the flask between and equi-distant from said supporting proj ections, flask sections and said clamping plate, whereby the force of said bolts is uniformly applied in line with the walls of the flask, in drawing the sections of the flask together.

HARRY H. HAZELTINE.

said bolts extending through said 

